在热模拟试验机上对铸态Ti40合金在950～1100℃、应变速率0.001～1.0 s-1范围内进行了热压缩实验,并基于动态材料模型理论建立了该合金的加工图,通过分析加工图和观察变形组织,研究了该合金的高温变形特性。结果表明,该合金加工图上失稳区范围为950～1040℃、0.1～1.0 s-1,功率耗散效率η值最小,为0.16～0.35,易出现局部流动现象。加工图上有两个η峰值区,范围分别为1070～1100℃、0.1～1.0 s-1和1000～1100℃、0.001～0.02 s-1,η值分别达到局部最大和整个加工图最大,分别为0.42～0.68和0.44～0.76,对应的变形特性均为动态再结晶,二者是优化的加工区。加工图上除失稳区和η峰值区以外,其它区域的η值为0.36～0.44,介于失稳区和峰值区的η值之间,是热变形时可选的区域。
Hot compression test for as-cast Ti40 alloy was carried out at 950-1100 ℃ and strain rate range of 0. 001-1.0 s-1 using a hot working simulator, and the processing maps for this alloy were plotted based on dynamic material model theory. By analyzing the processing maps and observing the deformation microstructure, the high temperature deformation characteristic of this alloy was studied. The results show that the instable zone is in the range of 950-1040 ℃ and 0. 1-1.0 s -1 with minimal value of the efficiency of power dissipation η about 0.16-0.35, and flow localization easily occurs in this zone. There are two zones with peak value of η, namely 1070- 1100 ℃ ,0. 1-1.0 s-1 and 1000-1100 ℃ ,0. 001-0.02 s-1 , in the processing maps with locally maximal value of η about 0.42-0. 68 and entirely maximal value of η about 0.44-0.76, respectively. These two zones are the optimized, and they correspond to the deformation characteristic of dynamic recrystallization. Except the zones discussed above in the processing maps, the rest zone with the η value about O. 36-0.44,which is between the values of η for the instable zone and the zone with peak value of η, may be selected for hot working.
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